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From: Jim Thompson on 13 May 2010 18:22 On Thu, 13 May 2010 13:52:17 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Thu, 13 May 2010 11:56:44 -0500, John O'Flaherty ><quiasmox(a)yeeha.com> wrote: > >>On Thu, 13 May 2010 09:45:57 -0700, John Larkin >><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >> >>>On Thu, 13 May 2010 11:02:58 -0500, John O'Flaherty >>><quiasmox(a)yeeha.com> wrote: >>> >>>>I see attenuation of 1/2 at the input, gain of 4 (3+1), and >>>>attenuation of 1/2 at the output. LTSpice agrees, unless I made a >>>>mistake. >>> >>> >>>You did. You left out the pot and the cap. >> >>That wasn't a mistake, it was a choice. I believe the intention of the >>circuit is to have that as an AC ground, that is, as an adjustable >>reference voltage. Is the fact that the capacitor size wasn't >>specified in the published circuit the mistake that you meant to point >>out? > >My point was that the gain and the frequency response change as the >offset pot is turned. Tacky. That wasn't your original point. Your original point was to say the gain was incorrectly stated. > >My other point is the Electronic Design will publish any old trivial >junk to fill in space between the ads. > >John > True. ...Jim Thompson -- | James E.Thompson, CTO | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | The only thing bipartisan in this country is hypocrisy
From: Michael A. Terrell on 13 May 2010 18:28 John Larkin wrote: > > On Thu, 13 May 2010 14:04:25 -0400, "Michael A. Terrell" > <mike.terrell(a)earthlink.net> wrote: > > > > >John Larkin wrote: > >> > >> Pease just drew another one of his hideous scribbles. > >> > >> Yes, lots of rusty VWs on his lawn and on the street. > >> > >> John > > > > > > Don't they have code enforcement out there? That would get you a > >huge fine in a lot of states, or even jail time. Some try to claim they > >are artists, but still end up in jail. > > We have street cleaning, once a week on each side of the street, and > you'll get a ticket if the car is out. That's really about it. A lot of places require any vehicle that isn't stored indoors to have a tag and insurance to prevent people's yards from turning into junkyards. -- Anyone wanting to run for any political office in the US should have to have a DD214, and a honorable discharge.
From: John O'Flaherty on 13 May 2010 18:45 On Thu, 13 May 2010 11:46:25 -0700 (PDT), George Herold <gherold(a)teachspin.com> wrote: >On May 13, 1:12�pm, John O'Flaherty <quias...(a)yeeha.com> wrote: >> On Thu, 13 May 2010 09:45:57 -0700, John Larkin >> >> <jjlar...(a)highNOTlandTHIStechnologyPART.com> wrote: >> >On Thu, 13 May 2010 11:02:58 -0500, John O'Flaherty >> ><quias...(a)yeeha.com> wrote: >> >> >>I see attenuation of 1/2 at the input, gain of 4 (3+1), and >> >>attenuation of 1/2 at the output. LTSpice agrees, unless I made a >> >>mistake. >> >> >You did. You left out the pot and the cap. >> >> Here's the version with pot and cap, working about as described: > >Yup, I slapped it onto a white proto-board to see if I was doing >something silly. I works fine! Yes. It's not really clever, and it doesn't go to DC, but it works fine. -- John
From: John Larkin on 13 May 2010 18:48 On Thu, 13 May 2010 18:28:03 -0400, "Michael A. Terrell" <mike.terrell(a)earthlink.net> wrote: > >John Larkin wrote: >> >> On Thu, 13 May 2010 14:04:25 -0400, "Michael A. Terrell" >> <mike.terrell(a)earthlink.net> wrote: >> >> > >> >John Larkin wrote: >> >> >> >> Pease just drew another one of his hideous scribbles. >> >> >> >> Yes, lots of rusty VWs on his lawn and on the street. >> >> >> >> John >> > >> > >> > Don't they have code enforcement out there? That would get you a >> >huge fine in a lot of states, or even jail time. Some try to claim they >> >are artists, but still end up in jail. >> >> We have street cleaning, once a week on each side of the street, and >> you'll get a ticket if the car is out. That's really about it. > > > A lot of places require any vehicle that isn't stored indoors to have >a tag and insurance to prevent people's yards from turning into >junkyards. Some places, like tony parts of Long Island, don't allow any vehicle to be parked on the street. That's to keep the riff-raff out of posh neighborhoods and off "our" beaches and parks. Some even forbid parking a vehicle in sight on your own property. In theory a car can't be parked here in the same place for more than 72 hours, but that's not much enforced. The weekly street cleaning pretty much takes care of that. I guess Pease shuffles his rusty VWs occasionally. John
From: John O'Flaherty on 13 May 2010 19:19
On Thu, 13 May 2010 13:52:17 -0700, John Larkin <jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >On Thu, 13 May 2010 11:56:44 -0500, John O'Flaherty ><quiasmox(a)yeeha.com> wrote: > >>On Thu, 13 May 2010 09:45:57 -0700, John Larkin >><jjlarkin(a)highNOTlandTHIStechnologyPART.com> wrote: >> >>>On Thu, 13 May 2010 11:02:58 -0500, John O'Flaherty >>><quiasmox(a)yeeha.com> wrote: >>> >>>>I see attenuation of 1/2 at the input, gain of 4 (3+1), and >>>>attenuation of 1/2 at the output. LTSpice agrees, unless I made a >>>>mistake. >>> >>> >>>You did. You left out the pot and the cap. >> >>That wasn't a mistake, it was a choice. I believe the intention of the >>circuit is to have that as an AC ground, that is, as an adjustable >>reference voltage. Is the fact that the capacitor size wasn't >>specified in the published circuit the mistake that you meant to point >>out? > >My point was that the gain and the frequency response change as the >offset pot is turned. Tacky. If the capacitor is chosen to put the 3 dB point well below the lowest frequency used, the gain for frequencies of interest doesn't change with the pot setting. >My other point is the Electronic Design will publish any old trivial >junk to fill in space between the ads. > >John > -- John |